Fluid-pressure brake



35r 6 and pipe 17.` i

Patente d Oct. 4,

p JosEPH ivrprtrno'iv;Vorl sfr. Louis, i/iissofiiisi;L Assieivonjro Trinwnsrineiaoiisnfnin BRAKE coiviPANYyoryWiLi/inn'nine; 'inNNsYLvAiviA, ACoitionn'rioitoif rENn-pj.

I sYLvANJIA;

` s FLUiD-Pnnssunn :ennxni Appiieafion fiiea November 2, 1326.` 'serialivo. 145,778.

vThis invention relates -to fiuid pressure brakes, and thelprincipalobject of thei-n-` vention is to provide a fiuid pressure brakevequipment having improved means f or seem- 6 ingl a high brake cylinderpressureiin Ian ernergency4 applicationvof thebrakes.

In the accompanying drawing, the single figure is a diagrainmatic view,partly in secfl tion, of a fluidpressure brake equipment ern- 10 bodyingmy invention. VIn order to illustrate anapplication of my invention, Ihave shown a vbrake equipment of the safety car Controljtype emp'loyingan emergency valve device as indicated generally'by the reference'numeral'L s rllhe emergency valve device may Comf,

prise a casing having avpiston 'Chamber 2, connected to the brake pipe 3and containing a piston 4, and having a valve Chamber 12 with a mainreservoir 13 and Vin release' position of the emergency valve device,fluid is supplied from valve Chamber 5 to a sand reservoir 14, throughport 15 in slide-valve According to my 'invention, a relay valve deviceis provided comprising'a Casing 18 o containing a flexible diaphragm19,' having the Chamber 20 at one side' connected through pipe 21 toa'pipe 22 andv-passage' 23, leading to the seat of Vslide valve v6, thepipeV 22 'being the usual pipe' through VWhich fluid under pressure issupplied to effect the sanding of the rails. 1 Aschamber 24 in theCasing 18 is Con'- `nected to the brake cylinder 8 through a pipe 25containing a non-return check valve 26. The diaphragm 19 is adapted tooperate an exhaust valve 27 `vvhich controls Com'- inunication fromChamber 24y to Chamber 28 having an atmospheric outlet port 29 and' asupply valve 30, which Contro'ls Vcommunication from Chamber 31 toChamber 24. Chamervoir 13.

containing a slide valve 6V adapted to be operated by piston 4:. Thevalvercasing also brake cylinder 8.'

'pipe 22, so that fluid un Vplied 'from reservoir '14 to effect the*sand-` ing of the rails and at the same time is 31 jis Connected throughtvith ali.

main 'reservovir 33. W, 'The main vreservoir 33 e vis maintainedlCharged with fiuid under'pressure` at,-,for example, ya. 'pressurebetvveen :and pounds, and the main reservoir'13 Vis tained Charged 'withfluid under rpressure f at, for vexample, a pressure of.50 pounds, 1

the main reservoirv 13 being charged,from.1 the main reservoir ,33throughpipe`j32.and,

afee'd or. reducing lvalve device 34,; adjlu'sted. so as to `supplypounds to the ,resen The usual'brake'valve't 1 plied With fiuid underpressure frointhe IOW pressure main reservoir 13 through main resvervoir pipe`35 and the pressure of VfiuidV in v normally used saidi'eservoir isthe lpressure under service conditions.

When, however,`an eme'rgency applicae tion is eifected by reducing thepressure in the bralce pipe 3, theemergency piston 15- is shifted toemergency position, and the 'emergencyslide valve 6 is operatedso thatpassage 36 is opened to the valve Chamber l5. "Fluid at the pressurecarried in thev main reservoir 13 is then supplied to the `the slidevalve 6 'Connects the sand `reservoir so In emergency position, z 1

pipe 17 ,through a Cavitr l37 With theisand r pressure is Sup--supplie'd to the diaphragm 19 of the relay; 1 valve device. Saiddiaphragm is thereupo'n V actuated, so as toclose the'exhaust valve 27'f eol L and openithe supply valve 30.

Fluid under pressure at the lfiigher pres-' v sure carried in the mainreservoir 33 is then supplied to pipe 25 and the brake cylinder,

A check valve in the pipe 12, prevents'back l floW of fluid at'thehigher pressure from.

the brake cylinder through the hemergency valve device to the mainreservoir'13.V

long enough torensure that the brake cylin-L reservoir :33.

The relay valve device* win afiwmatieaiiy' ioo The'relay valve device'Will reinain open'f i f der pressure Will be built up lto l thatin thereturn l`to. release position, -eitherpthrough system, rel'a yValvedevce for controlllig tvon With, a brake oylnder, of a' `lmainreser-

